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has learned would have learned learned had learned
弹簧发生压缩形变 弹簧弹力大小2mgsinθ 弹簧发生压缩形变 弹簧弹力大小mgsinθ 弹簧发生拉伸形变 弹簧弹力大小2mgsinθ 弹簧发生拉伸形变 弹簧弹力大小mgsinθ
伽利略根据理想斜面实验，提出了力不是维持物体运动的原因 经典力学的基础是牛顿运动定律，它适用于宏观和微观世界 安培提出了分子电流假说，并在磁场与电流的相互作用方面做出了杰出的贡献 法拉第发现了电磁感应现象，使人类从蒸汽机时代步入了电气化时代
物体克服摩擦力做功 
mgh 物体的重力势能增加了 mgh 物体的动能减少了 mgh 物体的机械能损失了 
mgh
两棒间的距离保持不变 两棒都做匀速直线运动 两棒都做匀加速直线运动 ab棒中的电流方向由b流向a
With Besides As for Because of
showed has shown will show is showing
as fluent as more fluent than so fluently as much fluently than
must drop must have dropped must be dropping must have been dropped
either none neither nobody
/; an; the a; the; / the; an; the a; the; the
内轨对内侧车轮轮缘有挤压 外轨对外侧车轮轮缘有挤压 这时铁轨对车轮轮缘没有挤压 如果速度变大，对内侧车轮轮缘的作用力一定变大
It’s your opinion I don’t mind It’s all up to you That’s your decision
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